eli5 Is there a reason the waste water like from showers can’t be filtered through pipes and used for toilet water?

Question

eli5 Is there a reason the waste water like from showers can’t be filtered through pipes and used for toilet water?

In: 797

Answer 1

a lot of places will do things like have your sink water be used to fill the cistern of your toilet before clean water gets put in to top it off for the next flush.

so you’d use the loo, flush, wash your hands and that water then goes to the cistern to wait for the next person.

no reason you can do this with things like a shower or bath too. I wouldnt do it with kitchen sink water.